The Class H tester is designed for metallic materials, especially those with high hardness or high toughness that require energy levels up to 750 J. Common materials include carbon steels, alloy steels, tool steels, stainless steels, cast irons, welded joints, heat-treated components and structural metals used in construction or manufacturing. Because the frame is rigid and the pendulum delivers consistent impact energy, the system handles demanding samples without losing accuracy.

Sub-size specimens are also supported, which makes the machine suitable for materials with limited sample availability or for applications where thickness varies. Although the system is optimized for metals, labs sometimes use it for research on certain non-metals or specialized composites as long as the sample dimensions match Charpy standards and the energy range is appropriate.

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